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English definition of “nuclear”

nuclear

adjective [always before noun]     /ˈnjuːkliər/
ENERGY B2 relating to the energy that is released when the nucleus (= central part) of an atom is divided: nuclear weapons/waste a nuclear power plantFuelsPetroleum products especially when used as fuelParticular theories and concepts in physics
PART OF ATOM relating to the nucleus (= central part) of an atom: nuclear physics Particular theories and concepts in physics
(Definition of nuclear adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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